New evaluations of simple models for small area population forecasts Tom Wilson Queensland Centre for Population Research The University of Queensland.

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Presentation transcript:

New evaluations of simple models for small area population forecasts Tom Wilson Queensland Centre for Population Research The University of Queensland 1

Background Population projection model for Queensland – State & large regions In 2011 new statistical geography introduced Queensland Government requested model extension to handle small areas Undertook a review of small area projection methods → recommended empirical testing of selected models Comprehensive study: 3 countries introduced new model large no. of averaged and composite models went beyond just assessment of forecast accuracy 2

Approach Case study countries: Australia; New Zealand; England & Wales Obtained 1991, 2001 and 2011 population estimates Fitted 10 simple models to population change Produced projections from 2001: “Projected” out to 2011 and compare against actual populations Projected further to 2031 to assess characteristics of projections 3 CountryArea typeNo. of areasMedian pop, 2001 AustraliaSA22,0727,704 New ZealandArea Unit1,7252,110 England & WalesCAS ward8,8394,842

Simple projection models LINLinear EXPExponential LIN/EXPLinear/Exponential Linear if positive base period change; exponential if negative MEXModified Exponential Growth rate dampened if pop very high or low CGDConstant Growth Rate Difference CSPConstant Share of Population FSPForecast Share of Population CSGConstant Share of Growth CSG+Constant Share of Growth Positive shares only VSGVariable Share of Growth Initial growth forecast using LIN/EXP Then adjusted to State growth using plus-minus method 4

Models tested Individual 10 individual models Averaged Average of 2, 3, 4 and 5 of every individual model. Total of 627 models. Composite Different models applied for 5 categories of base period growth rates, and 5 categories of launch year population size. Total of 100,000 x 2 models Two sets of projections (a)Forecast-constrained: small area projections adjusted to sum to State/national medium series projection for (b)Estimate-constrained: small area projections adjusted to sum to State/national population estimate in

Assessment Forecast accuracy Median Absolute Percentage Error (MedAPE) Credibility (i)Proportion of small areas with negative populations (ii)Ratio of the sum of unconstrained small area projections to the State or national total 6

Results: individual models: Australia 7

Results: individual models: England & Wales 8

Results: averaged models 9

Best averaged models: Australia 10

Best averaged models: England & Wales 11

Results: composite models 12

Results: growth rate composite models, Australia 13

Conclusions Individual models CSG+, CSP, VSG, LIN/EXP & MEX shown to avoid credibility problems and in many cases give low average errors. Small proportion of averaged & growth rate composite models out-performed the best individual models Which models are recommended? Best averaged models tended to include CSP and CSG+ or VSG Australia & New Zealand: CSP, CSG+, VSG average England & Wales: CSP, CSG+ average or CSP These projections can be treated as a ‘base layer’ which can be improved in certain places (e.g. using housing-unit model) Age-sex projections can be created by constraining a cohort-component model to totals generated by the simple methods. 14

Thank you Questions? If you would like a copy of the full paper please me: 15